121204240 has 20 divisors (see below), whose sum is σ = 281800044. Its totient is φ = 48481664.

The previous prime is 121204219. The next prime is 121204261. The reversal of 121204240 is 42402121.

It is an interprime number because it is at equal distance from previous prime (121204219) and next prime (121204261).

It can be written as a sum of positive squares in 2 ways, for example, as 18627856 + 102576384 = 4316^2 + 10128^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757447 + ... + 757606.

Almost surely, 2^121204240 is an apocalyptic number.

121204240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121204240 is an abundant number, since it is smaller than the sum of its proper divisors (160595804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121204240 is a wasteful number, since it uses less digits than its factorization.

121204240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515066 (or 1515060 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 121204240 is about 11009.2797221253. The cubic root of 121204240 is about 494.8868768468.

Adding to 121204240 its reverse (42402121), we get a palindrome (163606361).

The spelling of 121204240 in words is "one hundred twenty-one million, two hundred four thousand, two hundred forty".